Loglan-core

* Refactoring Exporter by torrua in https://github.com/torrua/loglan_core/pull/19

**Full Changelog**: https://github.com/torrua/loglan_core/compare/0.1.7...0.1.8

What's Changed
* Docstrings and WordSelector updates by torrua in https://github.com/torrua/loglan_core/pull/16

**Full Changelog**: https://github.com/torrua/loglan_core/compare/0.1.6...0.1.7

* Add more docstrings
* Add indexes

**Full Changelog**: https://github.com/torrua/loglan_core/compare/0.1.5...0.1.6

What's Changed
* Add CC to workflow by torrua in https://github.com/torrua/loglan_core/pull/13
* Add CC coverage by torrua in https://github.com/torrua/loglan_core/pull/14


**Full Changelog**: https://github.com/torrua/loglan_core/compare/0.1.4...0.1.5

**Full Changelog**: https://github.com/torrua/loglan_core/compare/0.1.3...0.1.4

Added new filters for KeySelector: **by_word** and **by_language**

**Full Changelog**: https://github.com/torrua/loglan_core/compare/0.1.2...0.1.3

Apply Black formatting
Optimize imports
Remove unused pylint disable comments
Add additional check while add new children
Update str and repr methods
Update requirements
Update documentation
Using code from BaseDefinition class
Refactor filters